sound.c

redboy for gba 是BPNS为GBA编写的一个小软件。软件的邹形是BASIC高级语言解释执行器。几经修改和扩展

#include <gba.h>
#include <rb_stdio.h>
extern const float Mfreq[7][6];//频率表
extern u8 music_cnt;
void set_sound_on();

void play_sound2(u16 fre)
{
   set_sound_on();
   REG_SOUND2CNT_L=0xf07f;
   REG_SOUND2CNT_H=SOUND1INIT+(0x07ff&fre);//设置频率
}
void play_snd2(u16 mus)
{
   music_cnt=(mus&0xff00)>>8;
   play_sound2(2048-131072/Mfreq[(mus&0x00f0)>>4][mus&0x000f]);
}

void set_sound_on()
{
	REG_SOUNDCNT_X = 0x80;
   //full volume, enable sound 2 to left and right
	REG_SOUNDCNT_L=0x2277;
   // Overall output ratio - Full
	REG_SOUNDCNT_H = 2;
}

void set_sound_off()
{
	REG_SOUNDCNT_X =0;
	REG_SOUNDCNT_L=0;
	REG_SOUNDCNT_H=0;
}
void sound2_test()
{
   set_sound_on();
   play_sound2(0x0fe0);
   play_snd2(0xff13);
   RBprint("AAAA");
}